Does AMP have support to facebook, twiiter and google plus share buttons? There's no clear information about this issue here or on github.
It's been proposed but not implemented yet: https://github.com/ampproject/amphtml/issues/1201
In meantime you can just create standard HTML links for these - which are much quicker to load than the bloated JavaScript official versions (though without interactive stuff like counters). For example see this page: https://web-design-weekly.com/2015/06/18/basic-performant-sharing-buttons/